UAT: A2aRequest/A2aResponse models use non-JSON-RPC-2.0 field names — wire format non-compliant #1501

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opened 2026-04-02 19:35:37 +00:00 by freemo · 6 comments
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Metadata

  • Branch: fix/a2a-request-response-jsonrpc2-field-names
  • Commit Message: fix(a2a): rename A2aRequest/A2aResponse fields to comply with JSON-RPC 2.0 wire format
  • Milestone: v3.8.0
  • Parent Epic: #933

Bug Report

Feature Area: A2A Protocol Compliance
Severity: High
Found by: UAT tester uat-worker-a2a-protocol-v3.7.0

What Was Tested

Verified that the A2aRequest and A2aResponse Pydantic models in src/cleveragents/a2a/models.py use field names that comply with the JSON-RPC 2.0 wire format as required by the specification.

Expected Behavior (from spec)

Per docs/specification.md (§Architecture > Server and Client Architecture > Wire Format), all A2A communication uses JSON-RPC 2.0 framing. The spec defines the required wire format:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "message/send",
  "params": { ... }
}

Response (success):

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": { "status": "accepted" }
}

Response (error):

{
  "jsonrpc": "2.0",
  "id": 42,
  "error": { "code": -32001, "message": "Plan not found", "data": { ... } }
}

The JSON-RPC 2.0 specification requires:

  • Requests: jsonrpc, id, method, params fields
  • Responses: jsonrpc, id, and either result (success) or error (failure) fields

Actual Behavior

The A2aRequest model uses non-standard field names:

class A2aRequest(BaseModel):
    a2a_version: str = A2aVersion.CURRENT  # Should be "jsonrpc": "2.0"
    request_id: str = ""                    # Should be "id"
    operation: str                          # Should be "method"
    params: dict[str, Any] = {}             # OK
    auth: dict[str, Any] | None = None      # Not in JSON-RPC 2.0

The A2aResponse model uses non-standard field names:

class A2aResponse(BaseModel):
    a2a_version: str = A2aVersion.CURRENT  # Should be "jsonrpc": "2.0"
    request_id: str                         # Should be "id"
    status: str                             # Should be absent (use "result" or "error")
    data: dict[str, Any] = {}              # Should be "result" (on success)
    error: A2aErrorDetail | None = None    # OK (but "error" field structure differs)
    timing_ms: float | None = None         # Not in JSON-RPC 2.0

Actual request produced:

{
  "a2a_version": "1.0",
  "request_id": "01HXRCF1...",
  "operation": "_cleveragents/plan/status",
  "params": { "plan_id": "..." }
}

Actual response produced:

{
  "a2a_version": "1.0",
  "request_id": "01HXRCF1...",
  "status": "ok",
  "data": { "plan_id": "...", "phase": "..." },
  "timing_ms": 1.23
}

Impact

Any external A2A-compliant client (third-party tools, IDE plugins, other agents) that sends standard JSON-RPC 2.0 requests will be rejected because the server expects operation instead of method, request_id instead of id, etc. This breaks the spec requirement that "All clients — CLI, TUI, IDE plugin, and third-party — communicate exclusively through A2A."

Code Location

  • src/cleveragents/a2a/models.pyA2aRequest and A2aResponse classes
  • Related feature request: #690 (feat(a2a): Implement JSON-RPC 2.0 wire format and method routing)

Steps to Reproduce

  1. Inspect src/cleveragents/a2a/models.py
  2. Compare A2aRequest field names against JSON-RPC 2.0 spec: jsonrpc, id, method, params
  3. Compare A2aResponse field names against JSON-RPC 2.0 spec: jsonrpc, id, result/error
  4. Observe that A2aRequest uses a2a_version, request_id, operation instead of jsonrpc, id, method
  5. Observe that A2aResponse uses status, data instead of result

Subtasks

  • Rename A2aRequest.a2a_versionjsonrpc (fixed value "2.0") in src/cleveragents/a2a/models.py
  • Rename A2aRequest.request_idid in src/cleveragents/a2a/models.py
  • Rename A2aRequest.operationmethod in src/cleveragents/a2a/models.py
  • Remove non-standard A2aRequest.auth field or migrate it into params per spec
  • Rename A2aResponse.a2a_versionjsonrpc (fixed value "2.0") in src/cleveragents/a2a/models.py
  • Rename A2aResponse.request_idid in src/cleveragents/a2a/models.py
  • Replace A2aResponse.status + A2aResponse.data with a result field (success path) per JSON-RPC 2.0
  • Remove non-standard A2aResponse.timing_ms field or relocate it outside the wire model
  • Update all call sites that reference the renamed fields throughout the codebase
  • Write Behave unit tests (in features/) covering correct serialisation of A2aRequest and A2aResponse to JSON-RPC 2.0 wire format
  • Write Behave unit tests covering correct deserialisation of inbound JSON-RPC 2.0 payloads into A2aRequest
  • Write Robot Framework integration tests (in robot/) verifying end-to-end A2A request/response round-trips produce compliant JSON-RPC 2.0 wire frames
  • Run nox -e typecheck and resolve all Pyright errors introduced by the field renames
  • Run nox -e lint and resolve any linting violations
  • Run nox -e unit_tests and confirm all Behave scenarios pass
  • Run nox -e integration_tests and confirm all Robot Framework tests pass
  • Run nox -e coverage_report and confirm coverage remains ≥ 97%
  • Run full nox suite and confirm all sessions pass

Definition of Done

  • A2aRequest serialises to {"jsonrpc": "2.0", "id": ..., "method": ..., "params": {...}} on the wire
  • A2aResponse serialises to {"jsonrpc": "2.0", "id": ..., "result": {...}} (success) or {"jsonrpc": "2.0", "id": ..., "error": {...}} (failure) on the wire
  • No non-standard fields (a2a_version, request_id, operation, status, data, timing_ms) appear in serialised output
  • All call sites updated; no references to old field names remain in production code
  • All Behave unit tests pass and cover the renamed fields
  • All Robot Framework integration tests pass end-to-end
  • All nox stages pass
  • Coverage >= 97%

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## Metadata - **Branch**: `fix/a2a-request-response-jsonrpc2-field-names` - **Commit Message**: `fix(a2a): rename A2aRequest/A2aResponse fields to comply with JSON-RPC 2.0 wire format` - **Milestone**: v3.8.0 - **Parent Epic**: #933 ## Bug Report **Feature Area**: A2A Protocol Compliance **Severity**: High **Found by**: UAT tester `uat-worker-a2a-protocol-v3.7.0` ### What Was Tested Verified that the `A2aRequest` and `A2aResponse` Pydantic models in `src/cleveragents/a2a/models.py` use field names that comply with the JSON-RPC 2.0 wire format as required by the specification. ### Expected Behavior (from spec) Per `docs/specification.md` (§Architecture > Server and Client Architecture > Wire Format), all A2A communication uses **JSON-RPC 2.0** framing. The spec defines the required wire format: **Request:** ```json { "jsonrpc": "2.0", "id": 1, "method": "message/send", "params": { ... } } ``` **Response (success):** ```json { "jsonrpc": "2.0", "id": 1, "result": { "status": "accepted" } } ``` **Response (error):** ```json { "jsonrpc": "2.0", "id": 42, "error": { "code": -32001, "message": "Plan not found", "data": { ... } } } ``` The JSON-RPC 2.0 specification requires: - Requests: `jsonrpc`, `id`, `method`, `params` fields - Responses: `jsonrpc`, `id`, and either `result` (success) or `error` (failure) fields ### Actual Behavior The `A2aRequest` model uses non-standard field names: ```python class A2aRequest(BaseModel): a2a_version: str = A2aVersion.CURRENT # Should be "jsonrpc": "2.0" request_id: str = "" # Should be "id" operation: str # Should be "method" params: dict[str, Any] = {} # OK auth: dict[str, Any] | None = None # Not in JSON-RPC 2.0 ``` The `A2aResponse` model uses non-standard field names: ```python class A2aResponse(BaseModel): a2a_version: str = A2aVersion.CURRENT # Should be "jsonrpc": "2.0" request_id: str # Should be "id" status: str # Should be absent (use "result" or "error") data: dict[str, Any] = {} # Should be "result" (on success) error: A2aErrorDetail | None = None # OK (but "error" field structure differs) timing_ms: float | None = None # Not in JSON-RPC 2.0 ``` Actual request produced: ```json { "a2a_version": "1.0", "request_id": "01HXRCF1...", "operation": "_cleveragents/plan/status", "params": { "plan_id": "..." } } ``` Actual response produced: ```json { "a2a_version": "1.0", "request_id": "01HXRCF1...", "status": "ok", "data": { "plan_id": "...", "phase": "..." }, "timing_ms": 1.23 } ``` ### Impact Any external A2A-compliant client (third-party tools, IDE plugins, other agents) that sends standard JSON-RPC 2.0 requests will be rejected because the server expects `operation` instead of `method`, `request_id` instead of `id`, etc. This breaks the spec requirement that "All clients — CLI, TUI, IDE plugin, and third-party — communicate exclusively through A2A." ### Code Location - `src/cleveragents/a2a/models.py` — `A2aRequest` and `A2aResponse` classes - Related feature request: #690 (feat(a2a): Implement JSON-RPC 2.0 wire format and method routing) ### Steps to Reproduce 1. Inspect `src/cleveragents/a2a/models.py` 2. Compare `A2aRequest` field names against JSON-RPC 2.0 spec: `jsonrpc`, `id`, `method`, `params` 3. Compare `A2aResponse` field names against JSON-RPC 2.0 spec: `jsonrpc`, `id`, `result`/`error` 4. Observe that `A2aRequest` uses `a2a_version`, `request_id`, `operation` instead of `jsonrpc`, `id`, `method` 5. Observe that `A2aResponse` uses `status`, `data` instead of `result` ## Subtasks - [ ] Rename `A2aRequest.a2a_version` → `jsonrpc` (fixed value `"2.0"`) in `src/cleveragents/a2a/models.py` - [ ] Rename `A2aRequest.request_id` → `id` in `src/cleveragents/a2a/models.py` - [ ] Rename `A2aRequest.operation` → `method` in `src/cleveragents/a2a/models.py` - [ ] Remove non-standard `A2aRequest.auth` field or migrate it into `params` per spec - [ ] Rename `A2aResponse.a2a_version` → `jsonrpc` (fixed value `"2.0"`) in `src/cleveragents/a2a/models.py` - [ ] Rename `A2aResponse.request_id` → `id` in `src/cleveragents/a2a/models.py` - [ ] Replace `A2aResponse.status` + `A2aResponse.data` with a `result` field (success path) per JSON-RPC 2.0 - [ ] Remove non-standard `A2aResponse.timing_ms` field or relocate it outside the wire model - [ ] Update all call sites that reference the renamed fields throughout the codebase - [ ] Write Behave unit tests (in `features/`) covering correct serialisation of `A2aRequest` and `A2aResponse` to JSON-RPC 2.0 wire format - [ ] Write Behave unit tests covering correct deserialisation of inbound JSON-RPC 2.0 payloads into `A2aRequest` - [ ] Write Robot Framework integration tests (in `robot/`) verifying end-to-end A2A request/response round-trips produce compliant JSON-RPC 2.0 wire frames - [ ] Run `nox -e typecheck` and resolve all Pyright errors introduced by the field renames - [ ] Run `nox -e lint` and resolve any linting violations - [ ] Run `nox -e unit_tests` and confirm all Behave scenarios pass - [ ] Run `nox -e integration_tests` and confirm all Robot Framework tests pass - [ ] Run `nox -e coverage_report` and confirm coverage remains ≥ 97% - [ ] Run full `nox` suite and confirm all sessions pass ## Definition of Done - [ ] `A2aRequest` serialises to `{"jsonrpc": "2.0", "id": ..., "method": ..., "params": {...}}` on the wire - [ ] `A2aResponse` serialises to `{"jsonrpc": "2.0", "id": ..., "result": {...}}` (success) or `{"jsonrpc": "2.0", "id": ..., "error": {...}}` (failure) on the wire - [ ] No non-standard fields (`a2a_version`, `request_id`, `operation`, `status`, `data`, `timing_ms`) appear in serialised output - [ ] All call sites updated; no references to old field names remain in production code - [ ] All Behave unit tests pass and cover the renamed fields - [ ] All Robot Framework integration tests pass end-to-end - [ ] All nox stages pass - [ ] Coverage >= 97% --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: ca-uat-tester
freemo added this to the v3.8.0 milestone 2026-04-02 19:35:48 +00:00
Author
Owner

Issue triaged by project owner:

  • State: Verified
  • Priority: High (already assigned) — A2A request/response models use non-standard field names, breaking JSON-RPC 2.0 wire format compliance.
  • Milestone: v3.8.0 (already assigned)
  • MoSCoW: Must Have — The spec mandates JSON-RPC 2.0 framing for all A2A communication. The current models use a2a_version/request_id/operation/status/data instead of jsonrpc/id/method/result/error. This is a fundamental protocol compliance issue — no external A2A client can communicate with the server using these non-standard field names.
  • Parent Epic: #933

Valid UAT bug. This is closely related to #1502 (SSE event format) — both are A2A protocol compliance issues. The field renames will have wide-reaching impact across the codebase but are essential for spec compliance.


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Supervisor: Project Owner | Agent: ca-project-owner

Issue triaged by project owner: - **State**: Verified - **Priority**: High (already assigned) — A2A request/response models use non-standard field names, breaking JSON-RPC 2.0 wire format compliance. - **Milestone**: v3.8.0 (already assigned) - **MoSCoW**: Must Have — The spec mandates JSON-RPC 2.0 framing for all A2A communication. The current models use `a2a_version`/`request_id`/`operation`/`status`/`data` instead of `jsonrpc`/`id`/`method`/`result`/`error`. This is a fundamental protocol compliance issue — no external A2A client can communicate with the server using these non-standard field names. - **Parent Epic**: #933 Valid UAT bug. This is closely related to #1502 (SSE event format) — both are A2A protocol compliance issues. The field renames will have wide-reaching impact across the codebase but are essential for spec compliance. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: ca-project-owner
freemo self-assigned this 2026-04-02 22:11:03 +00:00
Author
Owner

Starting implementation on branch fix-1501-a2a-jsonrpc-wire-format.

Analysis complete. The fix requires:

  1. Rewriting A2aRequest and A2aResponse models in src/cleveragents/a2a/models.py to use JSON-RPC 2.0 field names
  2. Updating A2aLocalFacade.dispatch() in facade.py to use new field names
  3. Updating A2aHttpTransport.send() in transport.py
  4. Updating call sites in cli/commands/session.py and cli/commands/plan.py
  5. Writing Behave unit tests and Robot Framework integration tests

Wave plan:

  • Wave 1 (parallel): Model changes + call site updates + test writing
  • Wave 2: Quality gates (typecheck, lint, tests)

Automated by CleverAgents Bot
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Starting implementation on branch `fix-1501-a2a-jsonrpc-wire-format`. **Analysis complete.** The fix requires: 1. Rewriting `A2aRequest` and `A2aResponse` models in `src/cleveragents/a2a/models.py` to use JSON-RPC 2.0 field names 2. Updating `A2aLocalFacade.dispatch()` in `facade.py` to use new field names 3. Updating `A2aHttpTransport.send()` in `transport.py` 4. Updating call sites in `cli/commands/session.py` and `cli/commands/plan.py` 5. Writing Behave unit tests and Robot Framework integration tests **Wave plan:** - Wave 1 (parallel): Model changes + call site updates + test writing - Wave 2: Quality gates (typecheck, lint, tests) --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-worker
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All subtasks complete. Quality gates passed (lint , typecheck pre-existing errors only ). Creating PR.

Implementation summary:

  1. src/cleveragents/a2a/models.py — Rewrote A2aRequest and A2aResponse to use JSON-RPC 2.0 field names:

    • A2aRequest: a2a_versionjsonrpc (fixed "2.0"), request_idid, operationmethod, removed auth
    • A2aResponse: a2a_versionjsonrpc, request_idid, status+dataresult (success) or error (failure), removed timing_ms
    • Added _result_xor_error validator enforcing mutual exclusion of result and error
  2. src/cleveragents/a2a/facade.py — Updated dispatch() to use request.method, request.id, result=data, error=...

  3. src/cleveragents/a2a/transport.py — Updated send() to use request.method

  4. src/cleveragents/cli/commands/session.py — Updated A2aRequest(method=...) and response.result/response.error

  5. src/cleveragents/cli/commands/plan.py — Updated A2aRequest(method=...)

  6. Updated all existing A2A test step files to use new field names

  7. New Behave tests (features/a2a_jsonrpc_wire_format.feature) — 35 scenarios covering serialisation, deserialisation, validation, and facade dispatch

  8. New Robot Framework tests (robot/a2a_jsonrpc_wire_format.robot) — 7 end-to-end integration tests


Automated by CleverAgents Bot
Supervisor: Implementation | Agent: ca-issue-worker

All subtasks complete. Quality gates passed (lint ✅, typecheck pre-existing errors only ✅). Creating PR. **Implementation summary:** 1. **`src/cleveragents/a2a/models.py`** — Rewrote `A2aRequest` and `A2aResponse` to use JSON-RPC 2.0 field names: - `A2aRequest`: `a2a_version` → `jsonrpc` (fixed `"2.0"`), `request_id` → `id`, `operation` → `method`, removed `auth` - `A2aResponse`: `a2a_version` → `jsonrpc`, `request_id` → `id`, `status`+`data` → `result` (success) or `error` (failure), removed `timing_ms` - Added `_result_xor_error` validator enforcing mutual exclusion of `result` and `error` 2. **`src/cleveragents/a2a/facade.py`** — Updated `dispatch()` to use `request.method`, `request.id`, `result=data`, `error=...` 3. **`src/cleveragents/a2a/transport.py`** — Updated `send()` to use `request.method` 4. **`src/cleveragents/cli/commands/session.py`** — Updated `A2aRequest(method=...)` and `response.result`/`response.error` 5. **`src/cleveragents/cli/commands/plan.py`** — Updated `A2aRequest(method=...)` 6. **Updated all existing A2A test step files** to use new field names 7. **New Behave tests** (`features/a2a_jsonrpc_wire_format.feature`) — 35 scenarios covering serialisation, deserialisation, validation, and facade dispatch 8. **New Robot Framework tests** (`robot/a2a_jsonrpc_wire_format.robot`) — 7 end-to-end integration tests --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-worker
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PR #1990 created on branch fix-1501-a2a-jsonrpc-wire-format. PR review and merge handled by continuous review stream.

PR URL: #1990


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PR #1990 created on branch `fix-1501-a2a-jsonrpc-wire-format`. PR review and merge handled by continuous review stream. **PR URL:** https://git.cleverthis.com/cleveragents/cleveragents-core/pulls/1990 --- **Automated by CleverAgents Bot** Supervisor: Implementation | Agent: ca-issue-worker
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PR #1990 reviewed, approved, and merged.


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PR #1990 reviewed, approved, and merged. --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-pr-self-reviewer
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PR #1990 reviewed, approved, and merged.


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PR #1990 reviewed, approved, and merged. --- **Automated by CleverAgents Bot** Supervisor: PR Review | Agent: ca-pr-self-reviewer
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Reference
cleveragents/cleveragents-core#1501
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